give it a google. reef central and other sites have a lot of stories. i have two glasscages tanks, and i am not really thrilled with them. thrilled with my fish, yes, but not the tanks. one is a 50g with overflow. the plastic trim around the inner edges of the tank is very strange, and makes it difficult to use HOBs (i stopped using a sump because the bulkhead gasket leaked after taking it apart and moving the tank).
I also have a 150g from them. Instead of having a solid rim all around the tank, there are gaps in the back of the tank to put HOBs in. This means that if something happens, like the front of the tank gets huge scratch on it somehow, I can never turn the tank around and view it from the other side. This is okay to an extent, except. . . these cut-outs are not wide enough to accomodate an Emperor 400. Which is what i planned on using for this tank. Yes, I know in hindsight that I should have double-checked the measurements and made sure the filters would fit (I bought them a couple months before tank delivery) but I had assumed that the tank openings would be compatible with such a common filter brand. Even if the trim had been solid so the front and back looked the same, a HOB filter still would not have fit on the tank.
Silicone job is messy on both tanks.